Patents by Inventor Norman S. Trouw

Norman S. Trouw has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for the preparation of polybenzimidazole membranes
    Patent number: 4693825
    Abstract: This invention is an improved process for the preparation of polybenzimidazole membranes. When benzyl alcohol is added to a polybenzimidazole casting dope, polybenzimidazole membranes useful in reverse osmosis may be prepared without annealing the membrane.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: September 15, 1987
    Assignee: Celanese Corporation
    Inventor: Norman S. Trouw
  • Process for the production of polybenzimidazole foams
    Patent number: 4598099
    Abstract: The present invention is a process for the preparation of novel polybenzimidazole foams. The foams exhibit a closed cellular structure and are prepared by forming a polybenzimidazole solution, adding sulfuric acid to the polybenzimidazole solution, removing the solvent, and heat treating the polybenzimidazole at a temperature of about 350.degree. to 600.degree. C.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: July 1, 1986
    Assignee: Celanese Corporation
    Inventor: Norman S. Trouw